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Activated charcoal cleans water mainly by adsorbing the impurities. You can also couple normal charcoal with sand and form alternate layers of charcoal and sand and pass water through it. It's a very effective Indian style of filtering water. Nearly all suspended particles gets blocked by the above mentioned filtering style. You can also convert normal ...

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There are many different ways of using chromatography. You may use it as an analytical tool, like in your figure. But you may also use it for preparatory goals. For example if you have a liquid containing some impurity that you know is adsorbed on silica or alumina, you may use a long and broad glass tube, put it in a vertical position and fill it with ...

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Generally, all chromatography is done on silica gel. It's the exact same procedure for TLC (thin layer chromatography), except that instead of paper you have a thin layer of glass covered with silica. What can be done in that case is scraping the spots, then extracting the product with organic solvents and filtration. There exists plates made for this, which ...

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Based on OP's question, I tentatively assumed OP is a novice to the isolation of organic compounds using column chromatography. Thus I'd explain this question with as basis as possible. This paper OP sighted is for the synthesis of 2$H$-chromenes (2$H$-benzopyrans). They can be non-polar to polar compounds based on the substitution on benzene nucleus. The ...

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